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Arrow Worm (Peter Parks/Oxford Scientific Films)

Arrow Worm, common name for certain small, transparent, free-swimming marine animals. They are 1 to 8 cm (y to 4 in) long, arrow-shaped, and...

Many worms occur only in the sea. The acorn worm has features that suggest a relationship to the chordate lineage. The arrow worm is a peculiar...

The Deuterostomia comprise the enterocoels—echinoderms, arrow worms, hemichordates, and chordates—the rest of the animal kingdom. These phyla are...

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Arrow Worm (Peter Parks/Oxford Scientific Films)

Worms, Germany (Ruggero Vanni/Corbis)

Helminth Worm (London Scientific Films/Oxford Scientific Films)

Slow-Worm (Mark Hamblin/Oxford Scientific Films)

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- spiny sea invertebrate: an invertebrate sea animal that has an arrow-shaped body and spines on its head for catching prey.

	Windows Live® Search Results Arrow Worm - MSN Encarta Arrow Worm, common name for certain small, transparent, free-swimming marine animals. They are 1 to 8 cm span style=font-family:MS Reference Specialty arrow worm - Wiktionary Definition from Wiktionary, a free dictionary arrow worm: Definition from Answers.com arrow worm n. Any of various small slender marine worms of the phylum Chaetognatha having a narrow, almost transparent body and sickle-shaped bristles See all search results in Windows Live® Search Results

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